Physicists led by Graz's Peter Puschnig mapped an exciton's wavefunction and watched it shrink about 25% within 400 femtoseconds. Using that to design better solar-cell materials depends on ab-initio modelling of the data and on donor/acceptor measurements the team has not yet made.
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A group at the University of Wisconsin-Madison reports in Physical Review X that a vertically aligned nanotube foam returns to a mechanical state it held before, with the record kept in nanoscale stick-slip friction.
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Screening the Coulomb interaction killed superconductivity in magic-angle graphene outright, which is strong evidence that the electrons do the pairing. It killed the correlated insulators too, narrowing the mechanism debate but not settling it.
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The team reconstructed an exciton wave function's shape and phase in an ordered 6T film on copper, which is the first stretch of the path from photon to current and stops well short of the step where the bound pair breaks apart.
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A Physical Review X paper reports that stretching hexagonal manganese telluride merges its magnetic domains and reverses the sign of its anomalous Hall voltage, leaving the magnetic order intact.
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